PMID: 16614414Apr 15, 2006Paper

Intestinal protein supply alters amino acid, but not glucose, metabolism by the sheep gastrointestinal tract

The Journal of Nutrition
S W El-KadiB J Bequette

Abstract

This study was intended to establish the extent which amino acids (AAs) and glucose are net metabolized by the gastrointestinal tract (GIT) of ruminant sheep when intestinal protein supply is varied. Wether sheep (n = 4, 33 +/- 2.0 kg) were fitted with catheters for measurement of net absorption by the mesenteric (MDV) and portal-drained (PDV) viscera and a catheter inserted into the duodenum for casein infusions. Sheep received a fixed amount of a basal diet that provided adequate metabolizable energy (10.9 MJ/d) but inadequate metabolizable protein (75 g/d) to support 300-g gain per day. Four levels of casein infusion [0 (water), 35, 70, and 105 g/d], each infused for 5.5 d, were assigned to sheep according to a 4 x 4 Latin square design. [methyl-(2)H(3)]leucine was infused (8 h) into the duodenum while [1-(13)C]leucine plus [6-(2)H(2)]glucose were infused (8 h) into a jugular vein. With the exception of glutamate and glutamine, net absorption of AAs increased linearly (P < 0.05, R(2) = 0.46-1.79 for MDV; P < 0.05, R(2) = 0.6-1.58 for PDV) with casein infusion rate. Net absorption by the PDV accounted for <100% of the additional supplies of leucine, valine, and isoleucine (0.6-0.66, P < 0.05) from casein infusion, whereas net...Continue Reading

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Citations

Dec 23, 2008·Journal of Animal Science·G B HuntingtonJ Burns
Nov 3, 2015·Journal of Animal Science·U AgarwalB J Bequette
Mar 21, 2009·Amino Acids·Guoyao Wu
Aug 19, 2007·Journal of Dairy Science·L DoepelH Lapierre
Jun 12, 2018·Current Drug Metabolism·Feiran WangShengli Li
Apr 30, 2019·Journal of Dairy Science·A N HristovZ Yu
Mar 1, 2009·Animal : an International Journal of Animal Bioscience·H LapierreG E Lobley
May 13, 2008·Journal of Animal Science·P R RegmiM Oba
Sep 9, 2011·Molecular Biology Reports·Chunping ZhaoJiuzhou Song
Jan 18, 2021·Journal of Dairy Science·H LapierreD R Ouellet
Apr 10, 2021·Journal of Animal Physiology and Animal Nutrition·Pengfei HouHongyun Liu

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